Analysis of Causes and Countermeasures for Yellowing and Abnormal Curing in Dual-Component Road Marking Construction

In the field of road marking construction, two-component marking coatings are becoming increasingly widely used due to their excellent wear resistance, high adhesion, rapid curing, and outstanding reflective effect. However, in the actual construction process, engineering teams and construction teams may encounter some common quality issues. As professionals who have accumulated rich experience in road marking construction at TOP ROAD Transportation Technology Co., Ltd., we are well aware that these issues not only affect construction efficiency, but also relate to the quality and durability of the markings. This article will combine practice to explore common problems and solutions in the construction of two-component marking coatings, aiming to help construction teams improve their operational level and ensure project quality.

1、 Yellow marking issue

Yellowing phenomenon after marking construction is one of the possible problems that two-component coatings may encounter. This is usually related to the curing process. If the amount of curing agent added is insufficient or the stirring is uneven, it will cause local curing time to be too long, leading to yellowing. In addition, during construction on newly laid asphalt pavement, pollution caused by oil reflux or tire rolling may also lead to dirty and yellowing of the marking surface. TOP ROAD Transportation Technology Co., Ltd. reminds that during construction, the curing agent should be strictly added according to the product instructions and thoroughly mixed to ensure sufficient reaction. For new asphalt pavement, it is recommended to open it to traffic for a period of time and wait for the road surface to stabilize before proceeding with the marking.
2、 Abnormal curing speed issue

Curing too quickly or too slowly can affect the construction progress and marking quality. The curing speed is mainly affected by the proportion of curing agent added and the ambient temperature. The higher the temperature, the less curing agent is usually required. Some construction personnel operate based on experience without precise measurement, which can easily lead to imbalanced proportions. In addition, using incompatible diluents (such as benzene solvents) or adding excessive diluents can also interfere with the curing reaction, resulting in non curing or slow curing. The solution is to use a specialized diluent specified by the manufacturer and accurately adjust the amount of curing agent added according to the ambient temperature to ensure uniform mixing. TOP ROAD has a professional research and development team, and its two-component products have a scientific ratio, which can provide construction guidance for different climate conditions.

Analysis of the Causes and Countermeasures of Yellowing and Solidification Abnormalities in the Construction of Two Component Road Markings

3、 Poor adhesion leads to detachment issues

Poor adhesion and detachment between the marking coating and the road surface are serious quality issues. The reasons may include: the newly laid asphalt pavement is oily, and the coating is difficult to effectively penetrate and bond; Cement pavement has sanding, low strength, or floating ash on the surface; The road surface is damp, with oil stains and dust that have not been cleaned thoroughly; Alternatively, construction can be carried out on excessively smooth surfaces such as steel plates or granite. In addition, if the two-component coating is applied on the partially cured cold paint marking or old hot melt marking, it may also peel off due to poor interlayer adhesion. TOP ROAD suggests that before construction, it is necessary to ensure that the base surface is dry, clean, and solid. For special base surfaces, specialized adhesive should be applied to enhance adhesion, and construction should be strictly carried out according to the compatibility requirements of different materials.

4、 The problem of insufficient brightness in reverse reflection

The poor reflective effect at night directly affects driving safety. In addition to the quality of the glass beads themselves (such as roundness index, refractive index) and the uniformity of distribution, the construction process is also crucial. For example, during scraping construction, if the ambient temperature is too high and the coating surface dries too quickly, the settling effect of glass beads may not be ideal. Incomplete curing can also affect the adhesion and reflective properties of glass beads. The solution is to select qualified reflective glass beads, control the environment and material temperature during construction, ensure complete curing of the coating, and evenly spread the glass beads according to standard processes. The two-component marking coating provided by TOP ROAD is formulated to facilitate uniform settling and firm adhesion of glass beads, ensuring long-lasting anti reflective performance.

5、 Low coating strength and non wear resistance issues

The rapid wear and tear of the markings after they are put into use is often related to premature opening of traffic. Although two-component coatings cure quickly, it takes some time to achieve optimal strength. If opened to traffic before fully curing, especially when crushed by heavy vehicles, it is highly likely to cause damage. In addition, uneven distribution of A and B groups (such as more B and less A), or excessive addition of curing agent leading to rapid reaction, may also cause the coating to become brittle and its strength to decrease. Therefore, sufficient maintenance time must be ensured before traffic can be opened, and ingredients and mixing must be strictly carried out in accordance with the prescribed proportions.

Analysis of the Causes and Countermeasures of Yellowing and Solidification Abnormalities in the Construction of Two Component Road Markings

6、 Line type issues caused by construction operations

During construction, there may be issues such as uneven coating thickness, uneven edges, or the appearance of “wavy patterns”. This is usually related to device status and operation. For example, unstable equipment pressure, mismatched or blocked spray gun head models, excessive coating viscosity, inconsistent diluent addition, etc. may all affect the uniformity of discharge and the smoothness of the line shape. Regular maintenance of equipment, selecting appropriate gun heads and parameters based on coating viscosity and construction requirements, and maintaining a uniform and stable travel speed during construction are key to avoiding such problems.

The construction quality of two-component marking coatings is a systematic project that involves the coordination of materials, equipment, processes, and environment. Choosing a supplier like TOP ROAD Transportation Technology Co., Ltd. with a stable product system and comprehensive technical support is crucial. TOP ROAD not only provides reliable quality of various marking coatings, but also offers powerful backend support for engineering and construction teams based on a wealth of on-site experience and summarized solutions. By understanding the causes of these common problems in advance and taking targeted measures, the construction team can effectively improve the first pass rate, reduce rework, and ensure the long-term and safety of road marking projects.

Our company is a professional manufacturer of road hot-melt coatings, road retroreflective measuring instruments, and road marking machines. If you are interested, please feel free to communicate with me via email at any time export@toproadtraffic.com